The United States has ended a four-month ban on passengers carrying laptops onboard US bound flights from certain airports in the Middle East and North Africa.<br/><br/>The US Department of Homeland Security (DHS) confirmed in a tweet that Riyadh's King Khalid International Airport was the last of 10 airports to be exempted from the ban. <br/><br/>Earlier, the ban was lifted on nine airlines, which are the only carriers to fly direct to the United States from the region. U.S. officials lifted the ban after visiting 10 airports in Egypt, Morocco, Jordan, the United Arab Emirates, Saudi Arabia, Kuwait, Qatar and Turkey over the past three weeks to confirm new security measures announced last month were being implemented. <br/><br/>The new requirements include enhanced passenger screening at foreign airports, increased security protocols around aircraft and in passenger areas and expanded canine screening.<br/><br/>In March, the United States banned large electronics in cabins on flights from 10 airports in the Middle East and North Africa over concerns that explosives could be concealed in the devices taken onboard aircraft.